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Abstract

An automatic sphygmomanometer for measuring the blood pressure of a subject based on Korotkoff sounds is adapted to analyze the transition of the pulse signal amplitude of a detected cuff pressure signal, set a range in which systolic blood pressure of the subject is capable of residing and a range in which diastolic blood pressure of the subject is capable of residing, and evaluate, based on appearance and disappearance of the Korotkoff sounds, whether the blood pressures that have determined reside in the set ranges. Preferably, the sphygmomanometer is provided with two amplifying/filtering circuits and two discriminating circuits using threshold values suited to each of the frequency characteristics of Korotkoff sound signals in the vicinity of the systolic and diastolic blood pressures. This improves the precision with which each blood pressure is determined. Preferably, the amplified/filtered signals and threshold signals of the two sets of circuits are capable of being externally extracted, and these signals are capable of being externally adjusted so that the electronic sphygmomanometer may be calibrated by making joint use of an auscultation method.

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First Claim